PQRS is a rhombus. PR =40cm, QR =42cm,then find perimeter of it.
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the Rhombus whose sides are 42/2 is equal to 21 cm and 40/2 is equal to 20 CM. Hence hypotenuse of rhombus is
= [21^2+20^2]^0.5
= [441+400]^0.5
= 841^0.5 cm
so the perimeter of rhombus is 4×841^0.5 cm
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